Cummins fault code 4485
EGR Valve Malfunction: condition exists
What it means
Cummins' description: EGR Valve Malfunction - Condition Exists.
SPN 5838 is EGR Valve Malfunction. FMI 31 means the ECM has confirmed the condition described in the code is happening.
The EGR system routes a measured amount of cooled exhaust back into the intake to lower combustion temperature and NOx. It uses a valve, a cooler, temperature sensors and a differential pressure sensor to measure flow.
What the lamp means
An amber (yellow) warning lamp means the engine can usually keep running, but the fault should be repaired soon, ideally the same day.
Green, yellow, red: three ways this can look
The same code can be a quick fix or a reason to shut down. Match your situation to the closest example.
Keep an eye on it
One EGR code that clears, with no power loss, smoke or coolant loss.
Schedule a repair
Amber lamp, rough running, more soot, or slow regens. EGR problems load the DPF and get worse with time, so schedule it.
Stop and get help
Coolant disappearing with white smoke, or a stop lamp. Shut it down. A leaking EGR cooler can push coolant into the engine and cause hydrolock or head gasket damage.
Common causes
The sensor reading itself is out of range or the condition is real, so look at the system:
- EGR valve sticking from soot buildup
- Clogged EGR cooler restricting flow
- Leaking EGR cooler (watch for coolant loss or white smoke)
- Boost or exhaust pressure problem affecting flow
- Real high EGR temperature from a failing cooler
What you can check before calling
- Check coolant level. Unexplained loss can point to an EGR cooler leak
- Look for white smoke or a sweet coolant smell from the exhaust
- Look for soot tracks or loose hoses around the EGR valve and pressure sensor
Clearing the code without fixing the cause usually brings it right back, and on emissions systems it can restart derate timers.
Engines and sources
Cummins uses the same fault code numbers across its electronic engines, including on-highway models like the ISB/B6.7, ISL/L9 and ISX/X15, though not every code applies to every engine or software level. Source: Cummins Tier 4 Fault Codes. Always confirm with Cummins service information (QuickServe) for your engine serial number.
Related EGR codes
- 3138 SPN 5019 FMI 2
Engine EGR Outlet Pressure: erratic or intermittent signal - 3137 SPN 5019 FMI 4
Engine EGR Outlet Pressure Sensor Circuit: circuit voltage low / shorted low - 3136 SPN 5019 FMI 3
Engine EGR Outlet Pressure Sensor Circuit: circuit voltage high / shorted high - 2962 SPN 412 FMI 16
EGR Temperature: reading above normal (moderately severe) - 2961 SPN 412 FMI 15
EGR Temperature: reading above normal (least severe) - 6555 SPN 2791 FMI 7
EGR Valve Control Circuit: not responding / out of adjustment
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does Cummins fault code 4485 mean?
Cummins fault code 4485 is J1939 SPN 5838 FMI 31: EGR Valve Malfunction - Condition Exists. In plain terms: egr valve malfunction: condition exists.
Can I keep driving with Cummins code 4485?
Usually for a short time, if the engine runs normally and no other warnings are on. Get it diagnosed soon, because many amber codes lead to a derate if ignored. Look at the green, yellow and red examples on this page to judge your situation.
What is the SPN and FMI for Cummins code 4485?
SPN 5838 identifies the part or system (EGR Valve Malfunction). FMI 31 describes the type of failure: condition exists.
What usually causes Cummins code 4485?
The most common causes are: eGR valve sticking from soot buildup; clogged EGR cooler restricting flow; leaking EGR cooler (watch for coolant loss or white smoke).
Diesel down in the Midlands?
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